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Feb 2, 2024 · Event-driven programming is a paradigm where the execution of a program is determined by events such as user actions or messages. Programs respond to events with predefined actions, allowing for asynchronous and responsive behavior, often seen in GUI applications and distributed systems.
- Why?
- The Publisher
- The Listener
- Event Dispatcher and Loop
- The Blurry Lines
- Use It Everywhere
Modern applications run in an active environment. Data comes in from the network. The user clicks a mouse button or drags their finger across the screen. Another program enters the foreground, pushing the current one into the background. The GPS and accelerometers update the device’s position. A scheduled alarm fires at the requested time. Event pr...
Each event requires a publisher, a component that advertises it can raise a particular event. Here we have a Keyboard service that raises KeyPressed and KeyReleased events as the user interacts with the keyboard. The KeyMessageis the type of message it generates for the event. Messages include the pertinent details about the event. In this case, we...
Somebody interested in the keyboard subscribes to these events. When the user presses a key, the OnKeyPressed function will be called. This function accepts a KeyMessageas an argument which provides it with the key that was pressed. The subscribing module can listen to events from several different publishers. Perhaps it is also listening to a Poin...
Event programming requires a dispatcher. Publishers need somewhere to post their messages. The dispatcher might be a core part of the OS, like the classic Windows PostMessagefunction, or it may be a library facility. In any case, each publisher connects to this dispatcher. Similarly, each listener subscribers to the dispatcher so it can receive the...
Some APIs or languages, like C#, expose synchronous “events”: these are processed immediately without an event loop. This is a weak form of the event paradigm as the synchronous nature makes it unsafe. The listener executes at the point where the publisher posts the message, therefore the publisher has to fear that the listener could call back into...
The event paradigm has become a staple of most programming. It’s the basis of virtually all UI programming. A lot of async IO follows this model, posting messages when data becomes available. Deferred processing, and promises, are also derived from this model, albeit with a more closed relationship between publisher and listener. The event paradigm...
- Edaqa Mortoray
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In computer programming, event-driven programming is a programming paradigm in which the flow of the program is determined by external events. Typical event can be UI events from mice, keyboards, touchpads and touchscreens, or external sensor inputs, or be programmatically generated (message passing) from other programs or threads, or network ...
May 2, 2023 · An event-driven architecture reacts to specific events or triggers within a system. It ingests data as events occur and allows the system to respond quickly to changes. This architecture is highly scalable and can efficiently handle large volumes of data from various sources which makes it a popular choice for modern applications and microservices.
Sep 7, 2022 · An event ingestor is a component or service that sits between event publishers and event consumers to decouple the production of an event stream from the...
Oct 11, 2023 · Event-driven programming (EDP) is a programming paradigm where external events determine the flow of program execution. These events come in different shapes: user actions (e.g., button clicks, keyboard inputs), system events (like a finished file download), messages from other programs, sensor outputs, etc.
An ingestor defines how we interpret inbound data from a device. Either a device or device type can have an ingestor with which it is associated. The ingestor is comprised of a listener, a handler, and an associated translator ID.Cloud vs Edge IngestorsIngestors can be run either in the cloud or on ...
